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Microbiological monitoring of drinking water of not centralized water supply



 © Group of authors, 2010 of UDC 504.4.054:504.064

E.B. Krasnova, T.V. Mosolova, I.Yu. Potapova MICROBIOLOGICAL MONITORING of DRINKING HE NETSENTRALIZOVANNOGO WATER of WATER SUPPLY

Center of Hygiene and Epidemiology in Primorsky Krai Federal State Healthcare Institution, Vladivostok

Today use of underground sources of water supply still remains relevant. Artesian wells, mine wells, a piping of springs for many settlements are the main sources of water supply. In this regard on sanitary bacteriological indicators of microbiological laboratories and its branches water of not centralized water supply ranks second The Center of Hygiene and Epidemiology in Primorsky Krai Federal State Healthcare Institution in structure of researches of water after water of the centralized water supply.

The greatest epidemiological importance belongs to water of mine wells which quality concedes to other underground sources. The reasons affecting water quality can be much, but the most important is the choice of the location of water intaking constructions, a depth of ground waters, flow directions of ground waters in respect of the settlement, the approximate power of water-bearing layer, a possibility of interaction with the existing or projected water intakes on

the neighboring sites and also with a surface water (pond, the swamp, a stream, a reservoir, the river). Security of a head of a well, that its land part which has to have a cover both to be covered with a canopy and to serve as protection of the mine against pollution and contamination. Failure to follow the listed requirements is the cornerstone of unsatisfactory water quality.

Since 2007 the volume of researches of water of not centralized water supply from 10.0% in 2007 up to 16.15% in 2009 annually grows in structure sanitarno - bacteriological researches of water on microbiological indicators in bacteriological laboratories of Primorsky Krai

The tendency to improvement of water quality of not centralized water supply sources on microbiological indicators was outlined: specific weight of the tests of water which are not answering according to hygienic standards was in 2007 - 62.2%, 2008 of-43.2% and 2009 - 42.2%. At a visible tendency to water quality improvement, the percent of unsatisfactory tests remains rather high.

Bacteriological laboratories of edge where this indicator exceeded srednekrayevy level

Territories 2006 2007 2008 2009

Arsenyev 77.4% 78.9% 40.0% 93.5%

Artyom 74.5% 95.2% 66.9% 69.6%

Kavalerovsky district 90.9% 62.1% 51.7% 66.7%

Chuguyevsky district 52.2% 42.0% 51.1% 50.1%

Yakovlevsky district 82.9% 65.9% 61.9% 63.0%

The key microbiological indicators characterizing extent of pollution of drinking water of not centralized water supply are the bacterium of group of colibacillus (BGC), total number mesophilic aerobic and optionally anaerobic microorganisms (OMCh), a coliphage.

When studying a microbic landscape from water of not centralized water supply it is revealed that the largest specific weight was made by the general prick-formnye bacteria (experimental design bureau) and thermotolerant prick-formnye bacteria (80.8% in 2007, 75.6% in 2008 and 76.6% in 2009). Specific weight of other finds grew from 18.6% in 2007 to 22.6% in 2009. The interest of identification of kolifag throughout all analyzed period was extremely low from 0.2% to 0.75%.

Thus, water of not centralized water supply can constitute danger in the epidemiological relation at its use without

preliminary processing, in a type of presence of bacteria of group of colibacillus in it that is an indirect witness about a possibility of infection of water with pathogenic microorganisms.

The most probable way of microbic pollution of water of not centralized water supply in Primorsky Krai - filtration of fecal and hozyaystvennobytovy waters owing to an unsatisfactory sanitary condition of wells, weak security of aquifers. The correct maintenance and operation of water intaking constructions, their regular repair, cleaning, disinfection and washing, the maintenance of the territories adjoining to them in satisfactory sanitary condition, use of underground waters from more protected aquifers are necessary for reduction of water quality of not centralized water supply according to requirements the SanPiN 2.1.4.1175-02.

80 HEALTH. MEDICAL ECOLOGY. SCIENCE 1-2 (41-42) - 2010
De Veen Karolien
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